Hoya UV filter, HMC (Hoya Multi Coated) with 52 mm filter diameter The ultraviolet filter absorbs the ultraviolet light rays that often make outdoor photos appear blurred and dull. It is a general purpose filter in nice weather, for both color and black and white film. The UV filter can also serve, placed in front of the lens, as an "everlasting" lens protector. - Suitable for digital cameras.